Is it only as black as widow ? Can it be white as snow ? Lingering, as a question i do not know. What i do know, there is an existance called shadow. We can see the shadow in all senses, Especially the sixth sense. Does it have any significance ? Does it have a purpose ? Is its existance coincidence ? Can it be exhibited as evidence ? Is it there, even when we dont see it in sight of light ? Does it always have to be a physical appearance ? Can we not have mental shadows, logically lingering. Can we not have shadows of the soul, emotionally lingering. Physically, as natural as creation. Consciencely, as natural as creation. Consciously, as natural as creation. Perhaps, reflecting the resemblance of life in other dimmentional realms in dimmentional angles.